Mail app works on one computer, not another — OS and settings identicalConnection Doctor reports "Trying to log in to this IMAP/SMTP account failed. Verify that the username and password are correct." — It's EXACTLY THE SAME as what I have working on my laptop. The only thing that has been done differently is that I set up Mail from Lion (or possibly Snow Leopard) then upgraded to Mavericks on the laptop, but the desktop had 10.9 to begin with. That cannot possibly be the problem.